CN110716719B - Method for realizing dynamic endorsement policy of financial block chain alliance platform transaction - Google Patents
Method for realizing dynamic endorsement policy of financial block chain alliance platform transaction Download PDFInfo
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Abstract
The invention provides a method for realizing a dynamic endorsement policy of a financial block chain alliance platform transaction, which comprises the steps of establishing a general rule expression model and an analysis module, reconstructing a semantic analyzer for a VSCC module of a Fabric platform, completing semantic analysis of the transaction endorsement policy, and verifying a transaction execution result according to an analysis result and a Peer node verification so as to realize the dynamic endorsement policy of the financial block chain alliance platform transaction.
Description
Technical Field
The invention belongs to the technical field of financial transaction safety, and particularly relates to a method for realizing a dynamic endorsement policy of a financial block chain alliance platform transaction.
Background
Currently, most of the alliance chains among financial institutions are realized based on a Fabric platform, and Fabric is a commercial-grade alliance chain platform provided by the Linux foundation HyperLedger project group. The invention provides a method for realizing transaction dynamic endorsement on a Fabric platform, which is not limited to the Fabric platform, and is also applicable to other similar alliance block chain platforms. The Fabric endorsement policy is to determine whether a business transaction is properly endorsed. When a Peer node receives a transaction request from a client, the Peer node invokes a system level intelligent contract VSCC for verifying the validity of the transaction.
The VSCC verification is mainly as follows:
1, all endorsement signatures of the transaction are valid;
2, meeting the number of endorsement signatures configured;
and 3, endorsing the signature node to meet the expectation of transaction information. An endorsement policy generally includes two parts, a signature body and a gate valve threshold. Signing principals are those principals endorsed by the initiating transaction node, principals are described in Fabric using an MSP to verify the signer identity and role and authority of the signer, currently supporting: the member and the administrator. The gate threshold includes two parameters, threshold t and principal n, representing t signatures obtained from n subjects.
On the Fabric platform, when the client sends a transaction to the subset peer node, the regular expression of the endorsement policy is attached to the transaction information. And after the sub peer node receives the block returned by the Order node, the VSCC verification endorsement strategy is invoked.
Through investigation, the financial alliance chain uses less endorsement policies, and in the few alliance chains using endorsement policies, the endorsement policies are generally directly specified when intelligent contracts are deployed. The current Fabric endorsement policy is implemented using a regular expression, with the body labeled msp. msp is the ID of the organization structure, role stands for role: a member or administrator. Such as: org1.Admin (administrator of institution 1). General syntax of rule expressions: EXPR (E [, E … ]), wherein EXPR takes the value AND, OR, NO keyword, uses "X" as wildcards, sets the definition of "(", ")" expression, saves the characters matching this expression to a temporary area (9 can be saved in one regular expression at most), they can be referenced by the symbols of \1 to \9. E is the subject described or is a nested EXPR expression.
Example 1: AND ('org1.membrane', 'org2.admin', 'org3.membrane') meaning: the members of organization 1, the administrator of organization 2, and the members of organization 3 are required to collectively sign endorse.
Example 2: OR ('org 1. Membrane', AND ('org 2. Membrane', 'org3. Admin')) meaning: a signature endorsement of the Org1 member or a signature endorsement common to the Org2 and Org3 organization administrators is required.
When an intelligent contract is deployed, the current Fabric endorsement strategy needs to specify a rule expression, the rule expression cannot be changed later, and a client must define a format according to the rule expression completely in sending request information, otherwise, the system contract cannot be identified, and dynamic adaptation according to transactions cannot be realized.
Disclosure of Invention
In order to solve the problems, the invention provides a method for realizing a dynamic endorsement policy of a financial blockchain alliance platform transaction, which comprises the following steps:
s1: the method comprises the steps that a universal rule expression model and a parsing module are established, and a semantic parser is reconstructed for a VSCC module of a Fabric platform;
s2: the semantic analysis of the transaction endorsement strategy is completed by identifying the keywords and the special characters through the reconstructed semantic analyzer in the S1;
s3: carrying out transaction signature on the semantic analysis result and collecting signature information by a subset Peer node:
s4: signature information collected in S3 is subjected to consensus in the Order node;
s5: verifying the transaction execution result at each Peer node;
further, the method for establishing the general rule expression model in the S1 specifically includes:
s11: introducing m-out-of-n-module and m-out-of-n-admin grammar, wherein m-out-of-n-module is to acquire signature endorsement information of m module nodes from n nodes; the m-out-of-n-admin is to acquire signature endorsement information of m admin nodes from n nodes;
s12: in a keyword functional bracket, determining a mechanism for acquiring a signature node by adding MSP (MSP) to an "&" symbol;
further, the step S12 specifically includes:
AND/OR/NO (X-out-of-Y-admin/member, & orgA, & orgB), wherein X is X signature endorsement information of manager roles acquired in Y institutions, which must contain orgA manager AND/OR does not contain orgB manager/common member roles, AND two grammars of m-out-of-n-member AND m-out-of-n-admin in S1 can be nested;
further, the analysis module in the S1 is a semantic analyzer which is used for reconstructing a VSCC module of the Fabric platform through a general rule expression model, and identifying keywords and special characters;
further, the step S2 specifically includes:
s21: sending a transaction request to a subset Peer node through a fabric client SDK;
s22: the subset Peer node executes the intelligent contract;
s23: the sub Peer node completes the semantic analysis of the transaction endorsement policy through the semantic analyzer reconstructed in the S1;
s24: the semantic analysis result is sent to a corresponding Peer endorsement node;
further, the step S3 specifically includes: verifying a transaction endorsement signature of a transaction, and collecting signature information when the transaction endorsement signature meets a collection condition, wherein the collection condition comprises that the endorsement signature is valid, the configured endorsement signature quantity is met, and endorsement signature nodes meet the expectation of the transaction information;
further, the step S4 specifically includes: at the Order node, the transaction is packed to generate a block, and broadcast is carried out to all Peer nodes through a message channel;
further, the step S5 specifically includes: the Peer node verifies the execution result of each transaction and submits the execution result to a local account book;
further, the keywords include AND, OR, AND NO, AND the recognition special characters include &, (,) AND-;
further, the result after executing the intelligent contract in S22 is not saved to the local ledger, and the world state of Fabric is not updated;
the beneficial effects of the invention are as follows:
the invention can support the self-contained endorsement scheme of the current financial alliance chain Fabric platform, effectively supplements the flexibility and the safety of the scheme, and provides a feasible scheme for dynamic endorsement of each transaction.
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FIG. 1 is a functional block diagram of the method of the present invention;
FIG. 2 is a diagram of the semantic parsing process of the expression according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. On the contrary, the invention is intended to cover any alternatives, modifications, equivalents, and variations as may be included within the spirit and scope of the invention as defined by the appended claims. Further, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. The present invention will be fully understood by those skilled in the art without the details described herein.
The invention will now be further described with reference to the drawings and specific examples, which are not intended to limit the invention. The following are preferred embodiments of the invention:
the invention provides a method for realizing a dynamic endorsement policy of a financial block chain alliance platform transaction, which comprises the following steps:
s1: the method comprises the steps that a universal rule expression model and a parsing module are established, and a semantic parser is reconstructed for a VSCC module of a Fabric platform;
s2: the semantic analysis of the transaction endorsement strategy is completed by identifying the keywords and the special characters through the reconstructed semantic analyzer in the S1;
s3: carrying out transaction signature on the semantic analysis result and collecting signature information by a subset Peer node:
s4: signature information collected in S3 is subjected to consensus in the Order node;
s5: verifying the transaction execution result at each Peer node;
further, the method for establishing the general rule expression model in the S1 specifically includes:
s11: introducing m-out-of-n-module and m-out-of-n-admin grammar, wherein m-out-of-n-module is to acquire signature endorsement information of m module nodes from n nodes; the m-out-of-n-admin is to acquire signature endorsement information of m admin nodes from n nodes;
s12: in a keyword functional bracket, determining a mechanism for acquiring a signature node by adding MSP (MSP) to an "&" symbol;
the step S12 specifically includes:
AND/OR/NO (X-out-of-Y-admin/member, & orgA, & orgB), wherein X is X signature endorsement information of manager roles acquired in Y institutions, which must contain orgA manager AND/OR does not contain orgB manager/common member roles, AND two grammars of m-out-of-n-member AND m-out-of-n-admin in S1 can be nested;
the analysis module in the S1 is a semantic analyzer which is used for reconstructing a VSCC module of the Fabric platform through a general rule expression model, and identifying keywords and special characters;
the step S2 specifically comprises the following steps:
s21: sending a transaction request to a subset Peer node through a fabric client SDK;
s22: the subset Peer node executes the intelligent contract;
s23: the sub Peer node completes the semantic analysis of the transaction endorsement policy through the semantic analyzer reconstructed in the S1;
s24: the semantic analysis result is sent to a corresponding Peer endorsement node;
the step S3 is specifically as follows: verifying a transaction endorsement signature of a transaction, and collecting signature information when the transaction endorsement signature meets a collection condition, wherein the collection condition comprises that the endorsement signature is valid, the configured endorsement signature quantity is met, and endorsement signature nodes meet the expectation of the transaction information;
the step S4 specifically comprises the following steps: at the Order node, the transaction is packed to generate a block, and broadcast is carried out to all Peer nodes through a message channel;
the step S5 specifically comprises the following steps: the Peer node verifies the execution result of each transaction and submits the execution result to a local account book; the keywords include AND, OR AND NO, AND the recognized special characters include &, (,) AND-; the result after the intelligent contract is executed in the S22 is not saved in a local account book, and the world state of Fabric is not updated;
the method is based on the problems in the endorsement strategy of Fabric in the prior art, namely, when intelligent contracts are deployed, rule expressions are required to be specified and cannot be changed later, and in the process of sending request information, a client must define a format completely according to the rule expressions, otherwise, the system contracts cannot be identified and dynamic adaptation according to transactions cannot be realized. The method for realizing the dynamic endorsement policy of the financial block chain alliance platform transaction is provided, and the method comprises the following specific processes:
the scheme builds a general rule expression model and an analysis module.
Constructing a rule expression model:
m-out-of-n-module and m-out-of-n-admin syntax are introduced.
m-out-of-n-member meaning: signature endorsement information of m member nodes is obtained from n nodes.
m-out-of-n-admin meaning: signature endorsement information of m admin nodes is obtained from n nodes.
In the keyword function brackets, the "≡symbol is used together with the mechanism that the MSP must definitely acquire the signature node.
Example 1: AND (3-out-of-10-admin, & org1, & org 2)
Meaning: signature endorsement information of 3 administrator roles is acquired in 10 institutions, and administrators of org1 and org2 must be contained.
Example 2: OR (2-out-10-member, & org1, & org 2)
Meaning: signature endorsement information of 2 common member roles is acquired in 10 institutions, and one common member role in org1 or org2 institutions is needed.
The scheme also supports two grammatical nesting uses of m-out-of-n-membrane, m-out-of-n-admin.
Example 3: OR (AND (2-out-of-10-admin), AND (2-out-of-10-membrane, & org 1))
Meaning: any 1 administrator role signature endorsement is obtained in 10 institutions, or 2 member nodes signature endorsements (members must contain org 1).
Through the above example, the transaction endorsement policy of the scheme is very flexible, can meet most of requirements of a financial alliance chain for endorsing according to transactions, and enhances the flexibility of the endorsement policy.
And a rule expression analysis module:
reconstructing a VSCC module of the Fabric platform, constructing a simple semantic analyzer, identifying keywords AND, OR, NO and the like, and identifying special characters: "&", "(", ")", "-" and so on.
The invention can support the self-contained endorsement scheme of the current financial alliance chain Fabric platform, effectively supplements the flexibility and the safety of the scheme, and provides a feasible scheme for dynamic endorsement of each transaction.
The whole flow of the transaction endorsement strategy is shown in fig. 1, the process is operated in software, and an operation mechanism specifically comprises the following steps:
1. the application program sends a transaction request to the subset Peer node through the fabric's client SDK.
2. The sub Peer node executes the smart contract. The intelligent contract execution result in this step is not saved to the local ledger, namely: the world state of Fabric is not updated.
3. And the sub Peer node completes the semantic analysis of the transaction endorsement policy and sends the semantic analysis to the specified Peer endorsement node of the transaction.
4. And the Peer nodes participating in endorsement execute the local intelligent contract and call the ESCC module to carry out transaction signature.
5. The sub Peer node collects signature information and verifies whether the endorsement signature of the transaction meets the conditions, namely (1, endorsement signature is valid, 2, the configured endorsement signature quantity is met, and 3, the endorsement signature node accords with the expectation of the transaction information).
6. The Order node completes consensus (the scheme takes Fabric1.0 as an example, and the consensus adopts order+KFK mode) and packages the transaction to generate a block. Broadcasting to all Peer nodes through a message channel.
7. The Peer nodes respectively verify the transaction execution results and submit the transaction execution results to the local account book.
For further explanation of the invention, abbreviations and key terms in the present invention are defined as follows:
the latest alliance blockchain platform of the super ledger sub-items of the Linux foundation is a commercial grade application version of a financial alliance formed by financial institutions such as civil banks, chinese banks and the like.
Orders node: a blockchain network node providing consensus services.
Ledger book: after the consensus of Orderers is stored in the account book, the transaction records are confirmed through the Peer nodes.
Summit Peer node: the client submits the transaction to the node, realizes the simulation execution of the transaction, and is in butt joint with an application system of the product.
The above embodiment is only one of the preferred embodiments of the present invention, and the ordinary changes and substitutions made by those skilled in the art within the scope of the present invention should be included in the scope of the present invention.
Claims (6)
1.A method for implementing a dynamic endorsement policy for a financial blockchain alliance platform transaction, the method comprising:
s1: the method comprises the steps that a universal rule expression model and a parsing module are established, and a semantic parser is reconstructed for a VSCC module of a Fabric platform;
s2: the semantic analysis of the transaction endorsement strategy is completed by identifying the keywords and the special characters through the reconstructed semantic analyzer in the S1;
s3: carrying out transaction signature on the semantic analysis result and collecting signature information by a SubmitPeer node:
s4: signature information collected in S3 is subjected to consensus in the Order node;
s5: verifying the transaction execution result at each Peer node;
the method for establishing the general rule expression model in the S1 specifically comprises the following steps:
s11: introducing m-out-of-n-module and m-out-of-n-admin grammar, wherein m-out-of-n-module is to acquire signature endorsement information of m module nodes from n nodes; the m-out-of-n-admin is to acquire signature endorsement information of m admin nodes from n nodes;
s12: in a keyword functional bracket, determining a mechanism for acquiring a signature node by adding MSP (MSP) to an "&" symbol; the step S12 specifically includes: AND/OR/NO (X-out-of-Y-admin/member, & orgA, & orgB), wherein X is X signature endorsement information of manager roles acquired in Y institutions, which must contain orgA manager AND/OR does not contain orgB manager/common member roles, AND two grammars of m-out-of-n-member AND m-out-of-n-admin in S1 can be nested;
the step S2 specifically comprises the following steps:
s21: transmitting a transaction request to a submitPeer node through a fabric client SDK;
s22: the SubmitPeer node executes the intelligent contract;
s23: the SubmitPeer node completes the semantic analysis of the transaction endorsement policy through the semantic analyzer reconstructed in the S1;
s24: the semantic analysis result is sent to a corresponding Peer endorsement node;
the step S3 is specifically as follows: and verifying the transaction endorsement signature of the transaction, and collecting signature information when the transaction endorsement signature meets a collection condition, wherein the collection condition comprises that the endorsement signature is valid, the configured endorsement signature quantity is met, and the endorsement signature node accords with the expectation of the transaction information.
2. The method of claim 1, wherein the parsing module in S1 is a semantic parser for reconstructing VSCC modules of the Fabric platform by using a general rule expression model, and identifies keywords and special characters.
3. The method according to claim 1, wherein S4 is specifically: and at the Order node, packaging the transaction to generate a block, and broadcasting to all the Peer nodes through a message channel.
4. The method according to claim 1, wherein S5 is specifically: and verifying the execution result of each transaction by the Peer node and submitting the execution result to a local account book.
5. The method of claim 2, wherein the keywords include AND, OR, AND NO, AND the recognition special characters include &, (,) AND +.
6. The method of claim 1, wherein the result after the execution of the smart contract in S22 is not saved to a local ledger and the world state of Fabric is not updated.
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